# (C++ programming Example for Beginners)

# C++ Program to Convert Binary Number to Decimal and vice-versa

#### In this example, you will learn to convert binary number to decimal, and decimal number to binary manually by creating user-defined functions.

## Example 1: C++ Program to convert binary number to decimal

```
#include <iostream>
#include <cmath>
using namespace std;
int convertBinaryToDecimal(long long);
int main(){
long long n;
cout << "Enter a binary number: ";
cin >> n;
cout << n << " in binary = " << convertBinaryToDecimal(n) << "in decimal";
return 0;
}
int convertBinaryToDecimal(long long n){
int decimalNumber = 0, i = 0, remainder;
while (n!=0)
{
remainder = n%10;
n /= 10;
decimalNumber += remainder*pow(2,i);
++i;
}
return decimalNumber;
}
```

**Output**

Enter a binary number: 1111 1111 in binary = 15

## Example 2: C++ Program to convert decimal number to binary

```
#include <iostream>
#include <cmath>
using namespace std;
long long convertDecimalToBinary(int);
int main(){
int n, binaryNumber;
cout << "Enter a decimal number: ";
cin >> n;
binaryNumber = convertDecimalToBinary(n);
cout << n << " in decimal = " << binaryNumber << " in binary" << endl ;
return 0;
}
long long convertDecimalToBinary(int n){
long long binaryNumber = 0;
int remainder, i = 1, step = 1;
while (n!=0)
{
remainder = n%2;
cout << "Step " << step++ << ": " << n << "/2, Remainder = " << remainder << ", Quotient = " << n/2 << endl;
n /= 2;
binaryNumber += remainder*i;
i *= 10;
}
return binaryNumber;
}
```

**Output**

Enter a decimal number: 19 Step 1: 19/2, Remainder = 1, Quotient = 9 Step 2: 9/2, Remainder = 1, Quotient = 4 Step 3: 4/2, Remainder = 0, Quotient = 2 Step 4: 2/2, Remainder = 0, Quotient = 1 Step 5: 1/2, Remainder = 1, Quotient = 0 19 in decimal = 10011 in binary

## C++ for Beginners: C++ Program to Convert Binary Number to Decimal and vice-versa

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